I think tarmac has had its day. Off-road audax ("roardax"? CORdax?) is taking over, with more events every year.
In the 2019 calendar, I predict only a few PBP qualifiers will be on tarmac (and a "lightweights" version of the Easter Arrow).
The AAA system will need a complete overhaul (what a shame after years of stability). New awards will surface ("least popular event", "muddiest post-ride party","most outrageous off-roading pun" )
What will we get in 2020? Bike biathlon?